Figure | Experimental Visualization and Quantification of Robustness in a Valley Photonic Crystal (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure | Experimental Visualization and Quantification of Robustness in a Valley Photonic Crystal

Caption

a, 3D rendition of the scanning electron micrograph of the VPC with a trapezoidal (Ω-shaped) structure along the domain wall, comprising four sharp corners and the two parity-inverted VPCs shown in false colors. The upper extension shows the full two-dimensional real-space amplitude map of the propagating edge state. b, Calculated backward/forward energy ratio before (ηR1) and after (ηR2) the Ω-shaped defect in the VPC domain wall. The inset shows how the back-propagation energies before and after the defect in a VPC are almost indistinguishable over the frequency range. Comparing this to the backward/forward energy ratios for an unoptimised W1 waveguide in c allowed to quantify back-scattering at a single corner to be < 0,07%.

Credit

by Sonakshi Arora, Thomas Bauer, René Barczyk, Ewold Verhagen and L. Kuipers

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